Reversing mechanism



J. BECKER.

REVERSI NG MECHANISM. APPLICATION FILED MAR-26. 1917.

1,368,556. Patented D 28, 1920.

2 SHEETS-SHEET 1.

Imvenfih v.- John Beaker,

J. BECKER.

REVERSING MECHANISM.

APPLICATION FILED MAR-26. 1917.

Patented Dec 28, 1920.

2 SHEETS-SHEET 2.

- lumen/E03 JOHN BECKER, 01? HYDE PARK, MASSACHUSETTS, ASSIGNGR TO BECKER MILLING MACHINE COMPANY, OF HYDE PARK, J'HASSACI-IUSETTS, A. CORPORATION OF MASSACHUSETTS.

BEVERSING MECHANISM.

Specification of Letters Patent.

Patented Dee. as, was.

original application filed April 21, 1910, Serial No. 556,718. Divided and this application filed March 26, 1917. Serial No. 157,331.

7 '0 all whom it may concern:

Be it known that l, Jot-1N Brenna, a citizen of the United States, and a resident of Hyde Park, in the county of Norfolk and State of Massachusetts, have invented an Improvement in Reversing Mechanism, of which the following description, in connection with the accompanying drawings, is a specification, like characters on the drawings representing like parts.

This invention relates toreversing mechanisms for milling and like machines, the mechanism being herein shown for purposes of illustration as applied to the work table of a milling machine. This application is a division of my copending application for standard and knee connections for milling machines which has now become Patent 1,225,726.

For the purpose of disclosing my invention I have here illustrated it in connection with a typical vertical milling machine, although it is to be understood that l have so disclosed my invention for illustrative purposes merely the invention itself being applicable to a variety of other machines.

The character of the invention may be best understood by references to the following description of an illustrative embodiment thereof shown in the accompanying drawings, wherein:

Figure 1 is a front elevation showing a vertical milling machine illustrating one embodiment of my invention;

Fig. 2, on an enlarged scale. shows parts of the feed reversing device;

Fig. 3 is a section taken on line 33 of Fig. 2;

Fig. 4: is a view similar to that shown in Fig. 2 but showing the parts in a different position;

Fig. 5' is a vertical section taken on line 55 of Fig. 4;

Fig. 6 is a section. taken on line 66 of Fig. 4.;

F 7 is a sectional detail of the device;

and I Fig. 8. on an enlarged scale. shows usual feed screw driving gears.

In the drawings, referring first to Fig. 1, the milling machine shown herein is employed merely as typifying any machine or use to which my invention is adapted, said machine in the present instance com prising a base or standard 1 being provided at or near its upper end with an overhanging arm in which is mounted a usual ver tical spindle 5 to which the tool is secured. The work support or table is indicated at 7 and is adapted to slide on the table base 9 carried by the vertically adjustable knee 11.

Referring now more particularly to Figs. 2 to 7, I will describe the means for reversing the feed of the table or work support. It is customary in machines of this type to take advantage of the travel of the work support or table to automatically reverse the feed thereof, the travel of the table in one direction or the other being relied upon to throw a clutch for connecting either of two oppositely rotating gears to the table feed screw shaft and reverse the feed of the table.

The work support or table herein may be fed by a usual feed screw'shaft 37 partly shown in Fig. 11 and rotated by a gear189 fast thereon which meshes with a pinion 41 loosely mounted on a short countershaft lf said pinion having a hub 45 rotative in a bearing 47 secured to the table base. Preferably integral with said hub is a bevel pinion 49 which may be connected to said shaft by a usual sliding clutch spool 53 splined on said countershaft 1-3. On the opposite side of said spool is a bevel pinion site direction by connecting the bevel gear 55 to said countershaft. the bevel gears be- .ing driven through an intermediate idler pinion 57 meshing with either of. said bevel gears 49 and 55. The spool 53 may be slid on said countershaftby a lever 59 adapted to be rocked manually by a handle 61 or automatically, as more fully hereinafter described. This lever may be connected by a rod 63 to my improved clutch controlling device shown. more particularly in Figs. 2 to 7 inclusive, which I will now describe.

Said disk their lower ends against the lug 71.

threaded in a lug 71 in the lower portion of said disk. The front face of this disk is provided with an annular groove 73 receiving opposed helical springs 75 abutting at -pressing lug 79 on a segmental plate 81 adjacent to said disk and also pivoted on the pin 67 referred to. This plate 81 is pro vided with a projection 83 which is adapted to be engaged by dogs 85 pivoted to and .depending from blocks 87 having portions fitted into a horizontal groove 88 in the face of the table 7 and adapted to be adjusted and held by suitable T-bolt-s 89 (Fig.

It will be apparent that in the travel of the table one or another of the dogs 85' will engage and rock the plate 81 and the lug 79 of the latter will engage the endsof one of the springs 7 5. To energize or compress the springs under this rocking movement of the plate 81 the disk herein is held from rotation at intervals by the engagement of spring pressedtriggers 91 with the under ends of inclined cam lugs 95 projecting from the periphery of said disk, said triggers being mounted atopposite sides of the disk 65 in sockets 93 secured to said base 9. The ends of the triggers preferably are wedge shaped V The springs 75, after being compressed by the rocking of the plate 81 with respect to the temporarily retained disk 65, may be released to rock the latter and through the 7 connecting rod 63 throw the spool clutch to if permit the disk 65'to be rocked by the exreverse the feed. To this end the plate 81 is providedwith lateral wings 103 carrying pins 105 which when said plate is rocked are adapted to engage the upper inclinations of said triggers and thereby press the latter into their sockets and out from beneath said diskcam, lugs 95 to release the latter and sired. V V V The outward movementfof the triggers 91v 7 under the pressure of their springs is limited by the en gagement of the stems 107 of trig- .ger controlling handles 109 with theinner' The 7 limits of longitudinal slots 111 in said sockets. .F or automatically stopping the feed at the completion of a cut in one direction or another, the triggers may be pressed into their sockets out of the path of' the disk cam lugs 95 and retained in their inner positions by rocking the handle stems 107 into short, transverse slots 113 communicating with said longitudinal slots'lll.

i To shift the clutch rod 63 directly by the engagement of the dogs 85 with the projection 83, the disk and segmental plate 81 may be connected torock together, by a cou pling 115 pivoted in a bifurcated endof said projection 83 and adapted to be rocked from the position shown in Fig. 3 into a slot 117 in said disk.

In operation it may be supposed that the parts are in the position shown in Fig. 2 with the spool'clutch in its central position (see Fig. 8) sothat neither of the feed screw bevel gears 49,55, will be connected to the counter-shaft 43., If the clutch handle 61 is shifted to the right the rod 63 will rock the disk 65 in a contra-clockwise direction and cause the right hand cam 95 to rest in bevel gear 55 will be connected to the shaft 43 and the table will start to travel to the right of Fig. 2. As the table travels in this direction eventually the left hand dog 85 (Fig. 2) will engage the projection 83 ofthe plate 81 and rock the latter in a clockwise direction thereby compressing the righthand spring until the right cam pin 105 on said plate engages the upper inclined end 97 of the right trigger 91. This will press said trigger into its socket out from beneath "the lug 95 and release the previously energized spring 75. Since the dog 85 continues to engage the lug 83 the expansive action of the spring will rock the disk 65 sharply in a clockwise direction carrying the left lug 95 above the level of the left trigger recess 101. The latter then springs outwardly and supports the same. in a manner similar to that just described for the right-hand lug. The rocking of the disk 65 into this position will throw the spool clutch 53 to the right disengaging the bevel gear 55 from the countershaft 43 (see Fig. 8) and connecting the opposite bevel gear 49 with said shaft.

' The feed screw shaft now will be driven in a direction'opposite to that of said countersh'a'ftand the table will travel toward the left of F ig. 2 thereby compressing thelefthand'spring 75, releasing the same and rocking the disk 65 in a contra-clockwise 'direction again to reverse the feed. It will be apparent that as the table travels alternately in opposite directions the clutch controlling device will operate indefinitelyto reverse the feed as described. I V

This feed reversing device'may be-used for a variety'of purposes; It may be supposed, for example, that it is desired to stop the feed of the table at the completion of a right-hand feed. While the table is traveling to the right the left-hand trigger 91 is 5 pressed into its socket 93 and locked by turning the trigger handle stem into the transverse slot 113. In the course of the travel of the table to the right the left-hand dog 85 will engage the projection 83, rock the plate 81, compress and release the righthand spring 7 5 to rock the disk 65 in a clockwise direction. This will throw the clutch to reverse the feed of the table. When the table travels to the left the left-hand spring 75 will not be compressed since the left-hand lug 95 is not supported by its trigger. As a result the right-hand dog 85 will engage the projection 83 and rock the plate 81 in a contraclockwise direction and the disk 65 will be similarly rocked under this movement of the dog 85 thereby rocking the disk into the mid position shown in Fig. 2 and with it the spool clutch into mid position without connecting either of the opposed bevel gears 49, 55, to the countershaft L3 and as a re sult the feed will be arrested.

In some classe of work it is desirable to make a rough initial cut and reverse the feed to make a finishing cut. By the device described, these two outs may be made and the feed automatically stopped. The heavy work brought to bear upon the tool as it makes its rough initial cut in certain classes of work cause the tool to spring away from the work more or less so that when the feed is reversed to make the lighter finishing out the spring of the tool back toward the work will be sufiicient to make the finishing out without any further adjustment of the tool.

In operating upon such a piece of work it may be supposed that it is desired to feed the table to the right of Fig. 2 and then to the left and stop. To effect this the lefthand trigger 91 is pushed in and locked.

The clutch handle 61 is then thrown to the right causing the right-hand cam lug 95 to be supported by its trigger 91. The table will then commence to feed to the right and in the course of its travel the left-hand dog 85 will engage the projection 83 compressing the right-hand spring, releasing the same to throw the clutch to the left and reverse the feed, but since the left-hand trigger 91 is withdrawn from the path of the left-hand disk lug 95 the left-hand spring 7 5 will not be compressed by this travel of table and therefore when the right-hand table dog 85 engages the projection 83 the latter will be rocked to its mid position and with it the clutch 58 and the feed stopped.

It will be observed that by my improved feed reversing device the direction of the feed may be changed simultaneously with the completion of its out and without the necessity of the excess travel for the purpose of reversing the feed which has hitherto been necessary. The ability to reverse at the finish of the cut is extremely advantageous since in certain classes of work it is desirable to make a cut on one portion of an article the cutting travel being limited by projecting portions of the article, such as a shoulder, for example.

I-Iaving described one embodiment of my invention, without limiting myself thereto except as defined by the following claims, what I claim as new and desire to secure by Letters Patent is:

1. In a mechanism of the class described, relatively movable members, spring means interposed therebetween, triggers alternately effective for preventing movement of one of said members while the other is moved to tension said spring means, means for tripping said triggers to render said spring means effective to shift the other member and means for holding one or another of said triggers in inoperative position, leaving said members free from control thereof.

2. In a mechanism of the class described for controlling operating means for a moving table, in combination, relatively movable members, a spring energized by the movements thereof, means to move one of said memberson movement of the table, means to release the spring for action on the operating means, and means to lock said movable members together against relative movement.

3. In a mechanism of the class described, in combination, an actuating device, energystoring means associated therewith, means for energizing the same through movement of a traveling member, detents for said actuating means and means operated by said traveling means to release the detents, said detents having provision whereby they may be removed at will from operative position.

4. In a mechanism of the class described, a crank wheel 65, springs housed in the crank wheel, a member 81 having a portion engaging the springs and a portion for actuation by a traveling member, detents for the wheel and trips on said member for operating the detents.

5. In a mechanism of the class described,

a shiftable member having a groove therein, detents therefor, a relatively movable member having a follower working in said groove, springs in the groove on opposite sides of the follower and means moving with the second member to trip the detents.

6. In a mechanism of the class described,

a journaled disk having an arc-shaped recess, a pivoted oscillating member thereon having a portion extending into said recess to swing along the same, springs in said recess adapted to be tensioned therein respectively by said oscillating member in opposite phases of said movement, detents for the disk and means moving with the oscillating member to trip the detents.

7. A mechanism as defined in claim wherein one of the members has. a latch therein and the other a recess: into which the latch may be moved to lock the two against jacent said members comprising casings,

spring-pressed lug-engaging plunger-s in the caslngs and a pin and angular slot connectlon between plungers and casings.

, 9. In aimechanism of the class described,

a wrist plate having, a concentric groove, a cover plate partially closing the groove, a member concentrically pivoted with the wrist-plate having an extension entering the groove, an abutment for engagement with the carrying member and depending por 'tions exterior to the wristplate, springs in the groove on opposite sides of the extension, lugs on the wrist-plate and detents for the lugs in the path of said depending portions and adapted to beodisplaced thereby.

In testimony whereof, I have signed my name to this specification.

JOHN BECKER. 

